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Benefit Plans, Domestic and Foreign Pension Plan Assets and Summary of Defined Benefit Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 296.7 | $ 320.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 244.0 | 261.4 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 32.7 | 34.0 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 20.0 | 24.8 |
Equity Securities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 162.8 | 179.2 |
US Equities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 135.4 | 156.1 |
US Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 135.4 | 156.1 |
US Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
US Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Non-US Equities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 27.4 | 23.1 |
Non-US Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 27.4 | 23.1 |
Non-US Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Non-US Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Fixed Income Securities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 113.6 | 116.0 |
Corporate Debt Instruments [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 113.6 | 116.0 |
Corporate Debt Instruments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 80.9 | 82.0 |
Corporate Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 32.7 | 34.0 |
Corporate Debt Instruments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 2.3 | 2.4 |
Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 2.3 | 2.4 |
Other [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 18.0 | 22.6 |
Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.3 | 0.2 |
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 17.7 | 22.4 |
U.S. Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 227.1 | 241.9 | $ 221.9
International Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 69.6 | $ 78.3 | $ 67.4

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